You can use the default-web.xml file to define features such as filters and security constraints that apply to all web applications.
For example, you can disable directory listings for added security. In your domain's default-web.xml file, search for the definition of the servlet whose servlet-name is equal to default, and set the value of the init-param named listings to false. Then redeploy your web application if it has already been deployed.
<init-param> <param-name>listings</param-name> <param-value>false</param-value> </init-param>
The mime-mapping elements in default-web.xml are global and inherited by all web applications. You can override these mappings or define your own using mime-mapping elements in your web application's web.xml file. For more information about mime-mapping elements, see the Servlet specification.
You can use the Admin Console to edit the default-web.xml file. For details, click the Help button in the Admin Console. As an alternative, you can edit the file directly using the following steps.